SKF Baker AWA-IV 12 HO, User Manual

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Only after the steps above have been taken is the power pack output enabled.
You must keep the power pack’s
Test button pressed during the above checks. After the
power pack’s outputs are enabled, red lights on the power pack will illuminate showing that
the power pack is active.
Increase the output voltage level until the target voltage is reached. Both the voltage and
current display will be active while you ramp up the test voltage. If the voltage is ramped too
quickly—by 1000 volts or more—the Baker AWA-IV will shut down the power pack and end
the test.
After the test voltage is successfully reached, the test timer on the Baker AWA-IV’s screen will
start counting down. When the test timer counts down to zero, the analyzer will
automatically stop the test, disable the power pack’s test leads, and discharge the windings.
A message dialog will appear letting you know that the leads are being discharged. Continue
to hold down the power pack’s Test button until you are instructed to release the button.
Figure 125. Test leads discharging message dialog.
CAUTION
Due to the polarization of the insulation in high-voltage motors, a
dangerous situation can develop if the motor is not completely discharged.
To completely discharge, a large motor requires that the motor’s leads
be held at ground potential for some time. IEEE 43/95 recommends a
grounding interval four times the amount of time the high-voltage DC was
applied to the windings.
If the windings are not allowed to completely discharge, a voltage can
develop on the motor leads that can be high enough to present a shock
hazard to personnel.
After the HiPot test successfully concludes, the analyzer will automatically start the surge
test.
Because the surge test for this example is being run by the power pack, the analyzer will once
again present screens instructing you to connect the power pack, press the Test button, and
so on.
As with the power pack HiPot test, the Baker AWA-IV will automatically verify that the
machine is set up properly before enabling the power pack output leads.
PUB CM/I4 71-015 EN V13.2 Static Motor Analyzer—Baker AWA-IV User Manual 123
Using power packs with 6/12 kV models